a:7:{i:0;s:9:"attach_id";i:1;s:9:"target_id";i:2;s:11:"target_type";i:3;s:8:"image_id";i:4;s:13:"last_modified";s:3:"_pk";s:9:"attach_id";s:5:"_type";a:5:{s:9:"attach_id";s:21:"mediumint(8) unsigned";s:9:"target_id";s:10:"bigint(20)";s:11:"target_type";s:11:"varchar(20)";s:8:"image_id";s:8:"char(32)";s:13:"last_modified";s:16:"int(10) unsigned";}}